SANTA CLARA, Calif.--(BUSINESS WIRE)--Relypsa, Inc., today announced the initiation of patient enrollment in the PEARL-HF study, a Phase 2b clinical trial of the company’s lead compound, RLY5016. A novel potassium binder designed for chronic use, RLY5016 is being evaluated in the prevention and treatment of hyperkalemia, for which there are no current satisfactory treatments.